If proven they have contaminated, they should!

I would guess that proving it was solely one company that caused PCB might prove to be difficult, but if the proof and conviction is there, then yes, Monsanto should be charged and ordered to pay for contamination and clean up. Monsanto should be responsible for their actions, and should value their company to reflect in a good light by offering to do such that, pay for it all.

Monsanto should have to compensate coastal cities for PCB contamination

With multiple deaths caused by PCB poisoning (mostly due to negligence on the part of Monsanto) there must be retribution paid. Monsanto cannot behave recklessly and must pay for the negative consequences of their actions. They should not be allowed to damage our shared environment in the pursuit of profits.

San Diego’s New Lawsuit Shows Just How Hard It Is To Hold Polluters Accountable

In a 1970 internal memo, agrochemical giant Monsanto alerted its development committee to a problem: Polychlorinated Biphenyls — known as PCBs — had been shown to be a highly toxic pollutant.PCBs — sold under the common name Aroclor — were also huge business, raking in some $10 million in profits. Not wanting to lose all of these profits, Monsanto decided to continue its production of Aroclor while alerting its customers to its potentially adverse effects. Monsanto got out of the PCB business altogether in 1977 — two years before the chemicals were banned by the EPA — but just because the company no longer produces the toxic substances doesn’t mean it can forget about them completely.Nor can the areas impacted by PCB pollution. On March 13, the city of San Diego, California filed a lawsuit against Monsanto for the company’s role in the production of PCBs.“PCBs manufactured by Monsanto (specifically, Aroclor compounds 1254 and 1260) have been found in Bay sediments and water and have been identified in tissues of fish, lobsters, and other marine life in the Bay,” the suit reads. “PCB contamination in and around the Bay affects all San Diegans and visitors who enjoy the Bay, who reasonably would be disturbed by the presence of a hazardous, banned substance in the sediment, water, and wildlife.”

Of course they should

It is only right to make such companies clean up their own 'mess'. All too often, you hear of how the likes of Monsanto get away with putting the lives of people living in the affected areas at risk. Furthermore, I feel that some of the damage done in such areas is irreversible and that ultimately, no one is held responsible.